Buffer overflow in Microsoft SQL Server 2025 (Cu8)

CVE-2026-67638

Heap-based buffer overflow in SQL Server allows an authorized attacker to execute code over a network.

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-67638?
CVE-2026-67638 is a high-severity vulnerability in Microsoft SQL Server 2025 (Cu8), classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2026-09-08.
How severe is CVE-2026-67638?
High severity. CVSS v3 base score is 8.8 out of 10.